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Unformatted text preview: 70. The fact that the ﬁelds are uniform, with the feature that the charge moves in a straight line, implies
the speed is constant (if it were not, then the magnetic force would vary while the electric force could
not – causing it to deviate from straight-line motion). This is then the situation leading to Eq. 29-7,
and we ﬁnd
|E | = v |B | = 500 V/m .
Its direction (so that F = q (E + v × B ) vanishes) is downward (in “page” coordinates). ...
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